What is the typical way the compressor and turbine disks connected to (LP/HP) shaft ? How are the disks connected to each other (e.g., curvic coupling, bolts or others ?)
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From The Jet Engine, Rolls Royce, issue 5: a compressor drum assembly. There are holes at the lower bit which attaches to the shaft, and another section of the book mentions hundreds of holes for bolts. These holes might be for fasteners.